This is a vinyl + DJ control tone + turntable slipmat package. The records are clear vinyl with music on one side, backed with Serato Control Tone on the other. The slipmats are a newly developed, an original design by Stones Throw: a thin, sturdy, dual fabric printed on one side, developed specifically for turntable DJs. The official Serato Control Tone is intended solely for use in conjunction with Serato DJ Software software.